/* eslint-disable no-unused-vars */
/* eslint-disable no-undef */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('leaflet'))
    : typeof define === 'function' && define.amd ? define(['leaflet'], factory)
      : (factory(global.L))
}(this, function (L$1) {
  'use strict'
  L$1 = L$1 && L$1.hasOwnProperty('default') ? L$1['default'] : L$1

  // functional re-impl of L.Point.distanceTo,
  // with no dependency on Leaflet for easier testing
  function pointDistance(ptA, ptB) {
    var x = ptB.x - ptA.x
    var y = ptB.y - ptA.y
    return Math.sqrt(x * x + y * y)
  }

  var computeSegmentHeading = function computeSegmentHeading(a, b) {
    return (Math.atan2(b.y - a.y, b.x - a.x) * 180 / Math.PI + 90 + 360) % 360
  }

  var asRatioToPathLength = function asRatioToPathLength(_ref, totalPathLength) {
    var value = _ref.value
    var isInPixels = _ref.isInPixels
    return isInPixels ? value / totalPathLength : value
  }

  function parseRelativeOrAbsoluteValue(value) {
    if (typeof value === 'string' && value.indexOf('%') !== -1) {
      return {
        value: parseFloat(value) / 100,
        isInPixels: false
      }
    }
    var parsedValue = value ? parseFloat(value) : 0
    return {
      value: parsedValue,
      isInPixels: parsedValue > 0
    }
  }

  var pointsEqual = function pointsEqual(a, b) {
    return a.x === b.x && a.y === b.y
  }

  function pointsToSegments(pts) {
    return pts.reduce(function (segments, b, idx, points) {
      // this test skips same adjacent points
      if (idx > 0 && !pointsEqual(b, points[idx - 1])) {
        var a = points[idx - 1]
        var distA = segments.length > 0 ? segments[segments.length - 1].distB : 0
        var distAB = pointDistance(a, b)
        segments.push({
          a: a,
          b: b,
          distA: distA,
          distB: distA + distAB,
          heading: computeSegmentHeading(a, b)
        })
      }
      return segments
    }, [])
  }

  function projectPatternOnPointPath(pts, pattern) {
    // 1. split the path into segment infos
    var segments = pointsToSegments(pts)
    var nbSegments = segments.length
    if (nbSegments === 0) {
      return []
    }

    var totalPathLength = segments[nbSegments - 1].distB

    var offset = asRatioToPathLength(pattern.offset, totalPathLength)
    var endOffset = asRatioToPathLength(pattern.endOffset, totalPathLength)
    var repeat = asRatioToPathLength(pattern.repeat, totalPathLength)

    var repeatIntervalPixels = totalPathLength * repeat
    var startOffsetPixels = offset > 0 ? totalPathLength * offset : 0
    var endOffsetPixels = endOffset > 0 ? totalPathLength * endOffset : 0

    // 2. generate the positions of the pattern as offsets from the path start
    var positionOffsets = []
    var positionOffset = startOffsetPixels
    do {
      positionOffsets.push(positionOffset)
      positionOffset += repeatIntervalPixels
      // eslint-disable-next-line no-unmodified-loop-condition
    } while (repeatIntervalPixels > 0 && positionOffset < totalPathLength - endOffsetPixels)

    // 3. projects offsets to segments
    var segmentIndex = 0
    var segment = segments[0]
    return positionOffsets.map(function (positionOffset) {
      // find the segment matching the offset,
      // starting from the previous one as offsets are ordered
      while (positionOffset > segment.distB && segmentIndex < nbSegments - 1) {
        segmentIndex++
        segment = segments[segmentIndex]
      }

      var segmentRatio = (positionOffset - segment.distA) / (segment.distB - segment.distA)
      return {
        pt: interpolateBetweenPoints(segment.a, segment.b, segmentRatio),
        heading: segment.heading
      }
    })
  }

  /**
* Finds the point which lies on the segment defined by points A and B,
* at the given ratio of the distance from A to B, by linear interpolation.
*/
  function interpolateBetweenPoints(ptA, ptB, ratio) {
    if (ptB.x !== ptA.x) {
      return {
        x: ptA.x + ratio * (ptB.x - ptA.x),
        y: ptA.y + ratio * (ptB.y - ptA.y)
      }
    }
    // special case where points lie on the same vertical axis
    return {
      x: ptA.x,
      y: ptA.y + (ptB.y - ptA.y) * ratio
    }
  }

  (function () {
    // save these original methods before they are overwritten
    var proto_initIcon = L.Marker.prototype._initIcon
    var proto_setPos = L.Marker.prototype._setPos

    var oldIE = (L.DomUtil.TRANSFORM === 'msTransform')

    L.Marker.addInitHook(function () {
      var iconOptions = this.options.icon && this.options.icon.options
      var iconAnchor = iconOptions && this.options.icon.options.iconAnchor
      if (iconAnchor) {
        iconAnchor = (iconAnchor[0] + 'px ' + iconAnchor[1] + 'px')
      }
      this.options.rotationOrigin = this.options.rotationOrigin || iconAnchor || 'center bottom'
      this.options.rotationAngle = this.options.rotationAngle || 0

      // Ensure marker keeps rotated during dragging
      this.on('drag', function (e) { e.target._applyRotation() })
    })

    L.Marker.include({
      _initIcon: function () {
        proto_initIcon.call(this)
      },

      _setPos: function (pos) {
        proto_setPos.call(this, pos)
        this._applyRotation()
      },

      _applyRotation: function () {
        if (this.options.rotationAngle) {
          this._icon.style[L.DomUtil.TRANSFORM + 'Origin'] = this.options.rotationOrigin

          if (oldIE) {
            // for IE 9, use the 2D rotation
            this._icon.style[L.DomUtil.TRANSFORM] = 'rotate(' + this.options.rotationAngle + 'deg)'
          } else {
            // for modern browsers, prefer the 3D accelerated version
            this._icon.style[L.DomUtil.TRANSFORM] += ' rotateZ(' + this.options.rotationAngle + 'deg)'
          }
        }
      },

      setRotationAngle: function (angle) {
        this.options.rotationAngle = angle
        this.update()
        return this
      },

      setRotationOrigin: function (origin) {
        this.options.rotationOrigin = origin
        this.update()
        return this
      }
    })
  })()

  L$1.Symbol = L$1.Symbol || {}

  /**
* A simple dash symbol, drawn as a Polyline.
* Can also be used for dots, if 'pixelSize' option is given the 0 value.
*/
  L$1.Symbol.Dash = L$1.Class.extend({
    options: {
      pixelSize: 10,
      pathOptions: {}
    },

    initialize: function initialize(options) {
      L$1.Util.setOptions(this, options)
      this.options.pathOptions.clickable = false
    },

    buildSymbol: function buildSymbol(dirPoint, latLngs, map, index, total) {
      var opts = this.options
      var d2r = Math.PI / 180

      // for a dot, nothing more to compute
      if (opts.pixelSize <= 1) {
        return L$1.polyline([dirPoint.latLng, dirPoint.latLng], opts.pathOptions)
      }

      var midPoint = map.project(dirPoint.latLng)
      var angle = -(dirPoint.heading - 90) * d2r
      var a = L$1.point(midPoint.x + opts.pixelSize * Math.cos(angle + Math.PI) / 2, midPoint.y + opts.pixelSize * Math.sin(angle) / 2)
      // compute second point by central symmetry to avoid unecessary cos/sin
      var b = midPoint.add(midPoint.subtract(a))
      return L$1.polyline([map.unproject(a), map.unproject(b)], opts.pathOptions)
    }
  })

  L$1.Symbol.dash = function (options) {
    return new L$1.Symbol.Dash(options)
  }

  L$1.Symbol.ArrowHead = L$1.Class.extend({
    options: {
      polygon: true,
      pixelSize: 10,
      headAngle: 60,
      pathOptions: {
        stroke: false,
        weight: 2
      }
    },

    initialize: function initialize(options) {
      L$1.Util.setOptions(this, options)
      this.options.pathOptions.clickable = false
    },

    buildSymbol: function buildSymbol(dirPoint, latLngs, map, index, total) {
      return this.options.polygon ? L$1.polygon(this._buildArrowPath(dirPoint, map), this.options.pathOptions) : L$1.polyline(this._buildArrowPath(dirPoint, map), this.options.pathOptions)
    },

    _buildArrowPath: function _buildArrowPath(dirPoint, map) {
      var d2r = Math.PI / 180
      var tipPoint = map.project(dirPoint.latLng)
      var direction = -(dirPoint.heading - 90) * d2r
      var radianArrowAngle = this.options.headAngle / 2 * d2r

      var headAngle1 = direction + radianArrowAngle
      var headAngle2 = direction - radianArrowAngle
      var arrowHead1 = L$1.point(tipPoint.x - this.options.pixelSize * Math.cos(headAngle1), tipPoint.y + this.options.pixelSize * Math.sin(headAngle1))
      var arrowHead2 = L$1.point(tipPoint.x - this.options.pixelSize * Math.cos(headAngle2), tipPoint.y + this.options.pixelSize * Math.sin(headAngle2))

      return [map.unproject(arrowHead1), dirPoint.latLng, map.unproject(arrowHead2)]
    }
  })

  L$1.Symbol.arrowHead = function (options) {
    return new L$1.Symbol.ArrowHead(options)
  }

  L$1.Symbol.Marker = L$1.Class.extend({
    options: {
      markerOptions: {},
      rotate: false
    },

    initialize: function initialize(options) {
      L$1.Util.setOptions(this, options)
      this.options.markerOptions.clickable = false
      this.options.markerOptions.draggable = false
    },

    buildSymbol: function buildSymbol(directionPoint, latLngs, map, index, total) {
      if (this.options.rotate) {
        this.options.markerOptions.rotationAngle = directionPoint.heading + (this.options.angleCorrection || 0)
      }
      return L$1.marker(directionPoint.latLng, this.options.markerOptions)
    }
  })

  L$1.Symbol.marker = function (options) {
    return new L$1.Symbol.Marker(options)
  }

  var isCoord = function isCoord(c) {
    // eslint-disable-next-line no-mixed-operators
    return c instanceof L$1.LatLng || Array.isArray(c) && c.length === 2 && typeof c[0] === 'number'
  }

  var isCoordArray = function isCoordArray(ll) {
    return Array.isArray(ll) && isCoord(ll[0])
  }

  L$1.PolylineDecorator = L$1.FeatureGroup.extend({
    options: {
      patterns: []
    },

    initialize: function initialize(paths, options) {
      L$1.FeatureGroup.prototype.initialize.call(this)
      L$1.Util.setOptions(this, options)
      this._map = null
      this._paths = this._initPaths(paths)
      this._bounds = this._initBounds()
      this._patterns = this._initPatterns(this.options.patterns)
    },

    /**
    * Deals with all the different cases. input can be one of these types:
    * array of LatLng, array of 2-number arrays, Polyline, Polygon,
    * array of one of the previous.
    */
    _initPaths: function _initPaths(input, isPolygon) {
      var _this = this

      if (isCoordArray(input)) {
        // Leaflet Polygons don't need the first point to be repeated, but we do
        var coords = isPolygon ? input.concat([input[0]]) : input
        return [coords]
      }
      if (input instanceof L$1.Polyline) {
        // we need some recursivity to support multi-poly*
        return this._initPaths(input.getLatLngs(), input instanceof L$1.Polygon)
      }
      if (Array.isArray(input)) {
        // flatten everything, we just need coordinate lists to apply patterns
        return input.reduce(function (flatArray, p) {
          return flatArray.concat(_this._initPaths(p, isPolygon))
        }, [])
      }
      return []
    },

    // parse pattern definitions and precompute some values
    _initPatterns: function _initPatterns(patternDefs) {
      return patternDefs.map(this._parsePatternDef)
    },

    /**
    * Changes the patterns used by this decorator
    * and redraws the new one.
    */
    setPatterns: function setPatterns(patterns) {
      this.options.patterns = patterns
      this._patterns = this._initPatterns(this.options.patterns)
      this.redraw()
    },

    /**
    * Changes the patterns used by this decorator
    * and redraws the new one.
    */
    setPaths: function setPaths(paths) {
      this._paths = this._initPaths(paths)
      this._bounds = this._initBounds()
      this.redraw()
    },

    /**
    * Parse the pattern definition
    */
    _parsePatternDef: function _parsePatternDef(patternDef, latLngs) {
      return {
        symbolFactory: patternDef.symbol,
        // Parse offset and repeat values, managing the two cases:
        // absolute (in pixels) or relative (in percentage of the polyline length)
        offset: parseRelativeOrAbsoluteValue(patternDef.offset),
        endOffset: parseRelativeOrAbsoluteValue(patternDef.endOffset),
        repeat: parseRelativeOrAbsoluteValue(patternDef.repeat)
      }
    },

    onAdd: function onAdd(map) {
      this._map = map
      this._draw()
      this._map.on('moveend', this.redraw, this)
    },

    onRemove: function onRemove(map) {
      this._map.off('moveend', this.redraw, this)
      this._map = null
      L$1.FeatureGroup.prototype.onRemove.call(this, map)
    },

    /**
    * As real pattern bounds depends on map zoom and bounds,
    * we just compute the total bounds of all paths decorated by this instance.
    */
    _initBounds: function _initBounds() {
      var allPathCoords = this._paths.reduce(function (acc, path) {
        return acc.concat(path)
      }, [])
      return L$1.latLngBounds(allPathCoords)
    },

    getBounds: function getBounds() {
      return this._bounds
    },

    /**
    * Returns an array of ILayers object
    */
    _buildSymbols: function _buildSymbols(latLngs, symbolFactory, directionPoints) {
      var _this2 = this

      return directionPoints.map(function (directionPoint, i) {
        return symbolFactory.buildSymbol(directionPoint, latLngs, _this2._map, i, directionPoints.length)
      })
    },

    /**
    * Compute pairs of LatLng and heading angle,
    * that define positions and directions of the symbols on the path
    */
    _getDirectionPoints: function _getDirectionPoints(latLngs, pattern) {
      var _this3 = this

      if (latLngs.length < 2) {
        return []
      }
      var pathAsPoints = latLngs.map(function (latLng) {
        return _this3._map.project(latLng)
      })
      return projectPatternOnPointPath(pathAsPoints, pattern).map(function (point) {
        return {
          latLng: _this3._map.unproject(L$1.point(point.pt)),
          heading: point.heading
        }
      })
    },

    redraw: function redraw() {
      if (!this._map) {
        return
      }
      this.clearLayers()
      this._draw()
    },

    /**
    * Returns all symbols for a given pattern as an array of FeatureGroup
    */
    _getPatternLayers: function _getPatternLayers(pattern) {
      var _this4 = this

      var mapBounds = this._map.getBounds().pad(0.1)
      return this._paths.map(function (path) {
        var directionPoints = _this4._getDirectionPoints(path, pattern)
          // filter out invisible points
          .filter(function (point) {
            return mapBounds.contains(point.latLng)
          })
        return L$1.featureGroup(_this4._buildSymbols(path, pattern.symbolFactory, directionPoints))
      })
    },

    /**
    * Draw all patterns
    */
    _draw: function _draw() {
      var _this5 = this

      this._patterns.map(function (pattern) {
        return _this5._getPatternLayers(pattern)
      }).forEach(function (layers) {
        _this5.addLayer(L$1.featureGroup(layers))
      })
    }
  })
  /*
 * Allows compact syntax to be used
 */
  L$1.polylineDecorator = function (paths, options) {
    return new L$1.PolylineDecorator(paths, options)
  }
}))
